Optical element with sub elements and an addressable mask

A light modulation device comprising an optical element and at least one addressable mask disposed adjacent to the optical element. The optical element comprises at least two sub-elements, each of the at least two sub-elements having at least one optical characteristic wherein at least one optical characteristic of one sub-element is discrete from at least one optical characteristic of another sub-element. The mask comprises at least two regions corresponding to the at least two sub-elements, each of the at least two regions being individually addressable to enable its corresponding sub-element to be light transmitting.